Studying Adaptation With Echo

In this paper, we discuss our work aiming at experimenting adaptation via mechanisms of selection in artiicial worlds (artiicial darwinism). We use J. Holland's Echo as the experimental platform. These experimentations have been performed along two ways. First, an initial cell having been injected in the world, we basically let the system evolves by itself to observe and analyze what the system produces. Cells having diierent behaviors emerge leading to a complex ecology. Second, we try to simulate situations observed in nature, namely food chains, parasitism, and batesian mimicry. Such simulations are dii-cult to obtain. We think that the rst approach is much more natural in that it leads us to study the dynamics of an evolutionary system. In this regard, the emergence of an ecology of diierent behaviors in unstable equilibrium is very interesting: an ecology has evolved from a trivial world initially inhabited by a single agent.